Human ancestors endured childbirth easier than modern women
Australopithecus sediba lived about 1.95 million years ago. By creating a three-dimensional model of a hominid pelvis, scientists compared it with models Australopithecus afarensis, Homo erectus, modern chimpanzees and humans. Researchers tested how a child’s skull passes through the birth canal of all species.
As it turned out, the size of the birth canal Australopithecus sediba was wide enough compared to the skull of a child. This means that females of Australopithecus of this species did not experience severe pain during childbirth. In humans, the ratio of the birth canal and the child’s skull is such that the baby’s head goes quite hard.
Why species evolved in this way, scientists do not yet know for sure.